Manufacture of vacuum vessels.



Patenm Feb.12,1918.

far/7A l H. B'ASTOW. MANUFACTURE OF VACUUM VESSELS.

APPLICATION FILEDMAR.14.1917- no rm 1 "H u ilillil l l? lrrlhhh lltol 49 EiLZlIhTUBFACTURE OF VACUUM VESSEL-F Application filed March 1e 5% 1135 107mm may] concern:

Be it known that l, HARRY BAsToW, a citizen of the United States, and a resident of Grafton, in the eounty of Allegheny and of Fennsylvaniu, have invented new and useful Improvements in the Manufacture of Vacuum Vessels of which the foll .5; is a full, clear, and exact description. invei "in relates to vacuum bottles and similar vessels made of glass and hav- 'iollow walls.

"he objectof the invention is to provide sin new and useful improvements in tcture of vacuum vessels whereby if: of VilllOllS slnpes and to be or 'veriety of purposes can be readily conomically produced, such, for iny vacuum bottles, or more vessels for containing it and suii'ieiently ntthe menu is aceomolished by a .2 bottom a louble wall the Jottom, end a integrally from the the double wall and cuts-"id depending Wall to form e it and the said bottom.

My this method into effect mold, such, for instance accompanying drawings eifi ation, in which 'racters o reuce indicate cor sending n l i all the views *igure 1 is a sectional. side elevation of old and. the blank formed therein;

. 9 e sectional plan View of the same o, sectional side elevation of the elevation of a "orm of ll"; 01 tilt mold is provided on undercut shoulder ll from nw 1O l l b ore is, ant. on. me SulC; drab be set the two or more T e mold, the parts he:- eonueoted with each other Specification of Letters Eatent.

essentially in noldoil the central core 12.

Patented Feb. 12, 1W8

, 1917. iz'erial No. 154,721"

sides 13 and ll is placed a ringQO provided on its under side With a short shoulder 21 fitting against the inner faceott' the mold sides 13 and From the ring 20 depends an annular core 22 spaced from the inner surface of the mold parts 13, 14 corresponding to the thickness of the outer Wall of the vessel to he made, as hereinafter more fully explained. The bottom of the core 22' is spaced from the top of the core 12, and from the said hottomvof the core 22 depend one or more pins 23 adapted to rest on top of the central core 1 The opening Ql of the ring 20 is arranged for the passage of the plunger 25, which latter is spaced from the inner surface of the core 22 and the top of the core 12, the side of the latter being spaced from the corresponding opposite inner surface of the mold sides 13 and 14, as plainly shown in. Fig. 1.

When the mold sides 13 and More in closed position on the base and. the ring is in position on top of the mold sides 13 and 14: then hot glass in proper quantity is placed into the mold and then the plunger 25 is forced downward in the usual manner for pressing the glass in the mold with a View to provide a bottom 30,-outer and inner walls 81, 32 rising in spaced relation from the said bottom and a Wall 33 depending from the bottom 30. The Vessel blank thus made is removed from the mold after the plunger 25 is Withdrawn, the ring 20 lifted off, and the sides 13, 1e unlocked and removed to permit of lifting the vessel blank The molded vessel blank is now placed in a snap or holding l around by the use of the snap or holding tool until the ends of the walls 31 and 32 merge one into the other. Instead of bending the upper end of the inner wall 32 out ward as described, the upper end of the outer wall 31 may be bent inward to merge with the inner wall 32, or the-upper ends of both walls'31 and 32 may be bent toward each otherto finally merge and form a vacuum joint. After sealing the inner and outer walls 31 and 32 the molded vessel blank is next reversed in the snap or holding tool and the wall 33 is warmed in and cut shut, that is, a compass-shaped tool is applied to the outer diameter near the bottom while the blank is being spun around in the snap and the circumference is gradually re- 's'tricted until the opening is completely closed, that is, the material of the edge of the wall 33 is integrally united to form with the bottom 30 another chamber 36, as plainly indicated in Fig. 3.

It will be noticed that by the method de scribed two chambers are formed, one an annular chamber in the double wall and the other between the two bottoms 30 and 33.

It will also be noticed that on lifting the ring 20 the projections or pins 23 leave openings 37 which connect the chambers 35 and 36 with each other. One of the mold parts, as shown. the mold part 14, is provided on its inner face with a lug 38 adapted to form a hole 39 inthe outer wall 31 for connection'with a vacuum producing device to form avacuum in the connected chambers 35 and 36 in the usual manner, it being understood that the hole 39'is sealed up after the desired f vacuum is obtained.

It is understood that by the asset the holes 37 only one vacuum producing operation is needed as without such holes 37 it would require the opening 39 shown and another similar opening" in the wall 33 to exhaust the air from the chamber 36. The hole 39 may also be used for introducing a silvering solution into the chambers 35 and 36 and pouring out the remainder after the precipitation is com leted.

In the modified orm shown in Fig. at, the core 22 on the ring 20 is dispensed with and the plunger 40 is providedgon the under side with an annular groove 4-1 thus providing a core 42 which corresponds to the core 22 to produce the inner wall 32 of the vessel blank.

From the foregoing it will be seen that by the method described, a large variety of vessels can .be'produced, such, for instance, as the ordinary vacuum bottles, vessels of the more squat open-mouthed shape used for retaining food after baking until the food is to be served, or vessels that may be used in fireless cookers by means of which foods are given a preliminary heating on an ordinary stove {and cooked lay-retaining their heat by means of heat-insulating apparatus insane? It is understood that -covers having a vacuum chamber are made in the same man nor as described.

lit will also be noticed that by this method glass vessels can be very cheaply manufactured.

Having thus described my invention, 1 claim as new and desire to secure by Letters Patent 2-.

1. The method of manufacturing hollow wall vessels which. consists molding a blank having a bottom, a double wall risinv integrally from the bottom and a single wall depending integrally from the said bottom,

sealing the ends of the double wall together to form a closed chamber between members of the double wall, and cutting shut the said depending wait to form a closed chamber between it and the said bottom.

.2. The method of manufacturing hollow wall glass vessels, consisting in molding a blank having a bottom, a. doable wall rising from the bottom and a singie wall depending from the bottom, uniting the upper spaced ends oi? the inner and outer walls of the double wallv form vacuum shame ber, and bending the single depending wall inward to unite the material of the edge of this wall to form with the said bottom a second vacuum chamber.

3. The method of manufacturing hollow wall glass vessels, consisting in molding a blank having a bottom, a double wall rising from the bottom with apertures in the bottom between the outer and inner walls of the said double wall, and a single wall depending from the bottom, uniting the upper spaced ends of the inner and outer walls of the double wall. to form a vacuum chamber, and bending the single depending wall inward to unite the material of the edge of this wall to form with the said bottom a second vacuum. chamber communicating with the first named chamber.

4:. The method of manufacturing hollow wall glass vessels, consisting in. molding a blank having a bottom, spaced inner and outer walls rising from the said bottom and a single wall depending from the said bottom, bending the upper portion of the inner wall outward and integrally uniting it with the outer wall to form a acuum chamber between the walls, bending the single'wall inward, and uniting the material The method of manufacturing hollow wall glass vessels,- consisting in molding a blank having a bottom from which rise integraily spaced inner and outer walls and integrally uniting the upper portions of the said walls to form a vacuum chamber between them.

3. The method at manufacturing hollow wall glass sessels, consisting in residing at are blank having a bottom from which rise integrally spaced inner and outer walls, bending the upper portion of the inner wall outwardly and integrally merging the edge of 5 the inner Wall with the outer Wall to form a vacuum chamber between the said inner and outer walls.

7.- The method of manufacturing hollow Wall giass vessels, consisting in molding a blank having a bottom, and a Wall depending' integrally therefrom, bending the said Wall inward and integrally uniting the material of the edge of the Wall to form with the said bottom a. vacuum chamber.

HARRY EAST (3 W, 

